Deadly school shootings in U.S. history

Friday's shooting at an Oregon high school injured at least three students. Look back at major school shootings in U.S. history.

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Dec. 14, 2012: Gunman Adam Lanza massacred 20 first-graders and six staff members at Sandy Hook Elementary School in Newtown, Conn. He shot his mother to death before going to the school, and killed himself as authorities arrived.

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